How can i fix my boiler vokera excell 80 sp?

what is the boiler water pressure a) when cold b) when hot

cold should be 1-1.5 bar, if over that, bleed from a radiator until as it should be

hot, if its correct when cold, but exceeds 2.5/3 bar when hot, either the expansion vessel has had it, or needs charging

if both hot and cold are fine (1-1.5 cold, not exceeding 2.5 hot) then there is a problem with the safety valve, it may need cleaning or replacing

T
June 2008